Scientific Paper on a Water Flea - 751 Words

The Effects of Alcohol and Caffeine on the Heartbeat Rate in Daphnia Magnus ï ¿ ¼ Erika Huizenga Ashley Kofahl The Effects of Alcohol and Caffeine on the Heartbeat Rate in Daphnia Magnus Abstract The projects purpose was to determine the effects of alcohol and caffeine on the heartbeat rate in Daphnia Magnus. Our hypothesis is alcohol causes a decrease in heart rate, whereas caffeine causes an accelerated heart rate, predicting that the more caffeine we give the daphnia the faster it heartbeat rate will become and the heartbeat rate will decrease as we give the Daphnia alcohol. After doing the experiment we found that the more caffeine we added to the Daphnia Magna the faster its heartbeat rate became. We also found that†¦show more content†¦We Placed 1 drop of a 1% caffeine solution on the Daphnia. After waiting for a few seconds we began to count the heart beats and recorded the results on our data sheet. Next we removed the excess solution from the Daphnia and flushed it with aquarium water. Using the same procedure we monitored the effects of 1 1/2% and 2.0% caffeine solutions and recorded our results and placed the Daphnia in the recovery tank. After completing the caffeine series, we obtained a the second set of drugs. This time instead of using caffeine we used varied concentrations of alcohol 2%, 4% and 6% using the same method as the caffeine procedure. Again recording our results and placing the Daphnia in the recovery tank when finished. Results The original purpose of this experiment was to determine how alcohol and caffeine effected the heartbeat rate of a Daphnia. The results of the experiment were that the higher percentage caffeine and alcohol placed onto the Daphnia the higher the heart rate. Average Daphnia Magnus Heartbeats per Minute ï ¿ ¼Ã¯ ¿ ¼ ï ¿ ¼ Conclusion After completing the experiment we found that when we gave the Daphnia caffeine the heartbeat rate did show an increase. However, we also found that alcohol also increased the number of times the heart beat. Even though we performed all of the experiments very carefully, we cannot be certain that the effect we saw was due to the drugs. Perhaps the change in heartbeat rate is caused byShow MoreRelatedDaphnia Experiment Report1504 Words   |  7 Pageseffect on heart rate. To test this, daphnia will be placed in water and then caffeine solution, so the difference in heart rates can be compared. Daphnia are small invertebrates that are found in aquatic environments, more commonly known as ‘water fleas’. They are approximately 3mm in length and have simple internal structures. They have transparent skin that allows you to view their internal organs, making them ideal subjects for scientific experiments. 2. 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